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作用：在无需重新加载整个网页的情况下，能够更新部分网页的技术通过少量数据交换，实现异部局部更新
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应用：社交软件，地图
操作步骤：1、利用html+css来实现页面，表达信息；2、用XMLHttpRequest和web服务器进行数据的异步交换3、运营js操作DOM，实现动态局部刷新">
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应用：社交软件，地图
操作步骤：1、利用html+css来实现页面，表达信息；2、用XMLHttpRequest和web服务器进行数据的异步交换3、运营js操作DOM，实现动态局部刷新">
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                异步的JavaScript和XML
              
            
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        <h1 id="概念介绍"><a href="#概念介绍" class="headerlink" title="概念介绍"></a>概念介绍</h1><p>AJAX的全称<br>Asynchronous JavaScript and XML<br>异步的JavaScript和XML</p>
<p>作用：在无需重新加载整个网页的情况下，能够更新部分网页的技术<br>通过少量数据交换，实现异部局部更新</p>
<p>应用：社交软件，地图</p>
<p>操作步骤：<br>1、利用html+css来实现页面，表达信息；<br>2、用XMLHttpRequest和web服务器进行数据的异步交换<br>3、运营js操作DOM，实现动态局部刷新；</p>
<p>XMLHttpRequest对象的出现分割了同步和异步。XMLHttpRequest出现之前是同步的，出现之后是异步的。<br>同步：页面请求实时传给服务器，导致必填数据没有填的时候，要回到页面上重新从头填写，耗时长、客户体验差。<br>异步：在页面必填项写上必填选项，不用通过传给服务器判断必填内容是否已经填写完整，耗时短、用户体验强。</p>
<h1 id="HTTP请求"><a href="#HTTP请求" class="headerlink" title="HTTP请求"></a>HTTP请求</h1><p>一个完整地HTTP请求过程，通常有7个步骤<br>1.建立TCP连接<br>2.Web浏览器向Web服务器发送请求命令<br>3.Web浏览器发送请求头信息<br>4.Web服务器应答<br>5.Web服务器发送应答头信息<br>6.Web服务器向浏览器发送数据<br>7.Web服务器关闭TCP连接</p>
<p>一个HTTP请求一般由四部分组成<br>1.HTTP请求的方法或动作，比如是GET还是POST请求<br>2.正在请求的URL，总得知道请求的地址是什么吧<br>3.请求头，包含一些客户端环境信息，身份验证信息等<br>4.请求体，也就是请求正文，请求正文中可以包含客户提交的查询字符串信息，表单信息等等</p>
<p>一个HTTP响应一般由三部分组成<br>1.一个数字和文字组成的状态码，用来显示请求是成功还是失败<br>2.响应头，响应头也和请求头一样包含许多有用的信息，例如服务器类型、日期时间、内容类型和长度等<br>3.响应体，也就是响应正文</p>
<p>GET：</p>
<ul>
<li>一般用于信息获取</li>
<li>使用URL传递参数</li>
<li>对所发送信息的数量也有限制，一般在2000个字符</li>
</ul>
<p>POST：</p>
<ul>
<li>一般用于修改服务器上的资源</li>
<li>对所发送信息的数量无限制</li>
</ul>
<h1 id="HTTP状态码"><a href="#HTTP状态码" class="headerlink" title="HTTP状态码"></a>HTTP状态码</h1><p>HTTP状态码由3位数字构成，其中首位数字定义了状态码的类型：<br>1XX：信息类，表示收到Web浏览器请求，正在进一步的处理中。<br>2XX：成功，表示用户请求被正确接收，理解和处理，例如：200 OK<br>3XX：重定向，表示请求没有成功，客户必须采取进一步的动作<br>4XX：客户端错误，表示客户端提交的请求有错误，例如：400 NOT FOUND 意味着请求中所引起的文档不存在<br>5XX：服务器错误，表示服务器不能完成对请求的处理：如500</p>
<h1 id="XMLHttpRequest发送请求"><a href="#XMLHttpRequest发送请求" class="headerlink" title="XMLHttpRequest发送请求"></a>XMLHttpRequest发送请求</h1><p>var request = new XMLHttpRequset();<br><code>open(method,url,async)</code><br><code>send(string)</code></p>
<p>GET 发送请求</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">request.open(&apos;GET&apos;,&apos;get.php?id=55&apos;,true);</div><div class="line">request.send();</div></pre></td></tr></table></figure>
<p>POST 发送请求</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">request.open(&quot;POST&quot;,&quot;create.php&quot;,true);</div><div class="line">request.setRequestHeader(&quot;Content-type&quot;,&quot;application/x-www-form-urlencoded&quot;);</div><div class="line">request.send(&quot;name=uiste&amp;sex=man&quot;);</div></pre></td></tr></table></figure>
<h1 id="XMLHttpRequset取得响应"><a href="#XMLHttpRequset取得响应" class="headerlink" title="XMLHttpRequset取得响应"></a>XMLHttpRequset取得响应</h1><p>responseText：获得字符串形式的响应数据<br>responseXML： 获得XML形式的响应数据<br>status和statusText：以数字和文本形式返回HTTP状态码<br>getAllResponseHeader()：获取所有的响应报头<br>getResponseHeader()：查询响应中的某个字段的值</p>
<h1 id="readyState属性"><a href="#readyState属性" class="headerlink" title="readyState属性"></a>readyState属性</h1><p>0：请求未初始化，open还没有调用<br>1：服务器连接已建立，open已经调用了<br>2：请求已接收，也就是接收到头信息了<br>3：请求处理中，也就是接收到响应主体了<br>4：请求已完成，且响应已就绪，也就是响应完成了</p>
<h1 id="源码案例"><a href="#源码案例" class="headerlink" title="源码案例"></a>源码案例</h1><p><img src="http://7xwlfk.com1.z0.glb.clouddn.com/AJAX.png" alt="AJAX"></p>
<hr>
<h2 id="json"><a href="#json" class="headerlink" title="json"></a>json</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div></pre></td><td class="code"><pre><div class="line">&lt;script&gt;</div><div class="line"><span class="built_in">document</span>.getElementById(<span class="string">"search"</span>).onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123; </div><div class="line">	<span class="keyword">var</span> request = <span class="keyword">new</span> XMLHttpRequest();</div><div class="line">	request.open(<span class="string">"GET"</span>, <span class="string">"serverjson.php?number="</span> + <span class="built_in">document</span>.getElementById(<span class="string">"keyword"</span>).value);</div><div class="line">	request.send();</div><div class="line">	request.onreadystatechange = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">		<span class="keyword">if</span> (request.readyState===<span class="number">4</span>) &#123;</div><div class="line">			<span class="keyword">if</span> (request.status===<span class="number">200</span>) &#123; </div><div class="line">				<span class="keyword">var</span> data = <span class="built_in">JSON</span>.parse(request.responseText);</div><div class="line">				<span class="keyword">if</span> (data.success) &#123; </div><div class="line">					<span class="built_in">document</span>.getElementById(<span class="string">"searchResult"</span>).innerHTML = data.msg;</div><div class="line">				&#125; <span class="keyword">else</span> &#123;</div><div class="line">					<span class="built_in">document</span>.getElementById(<span class="string">"searchResult"</span>).innerHTML = <span class="string">"出现错误："</span> + data.msg;</div><div class="line">				&#125;</div><div class="line">			&#125; <span class="keyword">else</span> &#123;</div><div class="line">				alert(<span class="string">"发生错误："</span> + request.status);</div><div class="line">			&#125;</div><div class="line">		&#125; </div><div class="line">	&#125;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="built_in">document</span>.getElementById(<span class="string">"save"</span>).onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123; </div><div class="line">	<span class="keyword">var</span> request = <span class="keyword">new</span> XMLHttpRequest();</div><div class="line">	request.open(<span class="string">"POST"</span>, <span class="string">"serverjson.php"</span>);</div><div class="line">	<span class="keyword">var</span> data = <span class="string">"name="</span> + <span class="built_in">document</span>.getElementById(<span class="string">"staffName"</span>).value </div><div class="line">	                  + <span class="string">"&amp;number="</span> + <span class="built_in">document</span>.getElementById(<span class="string">"staffNumber"</span>).value </div><div class="line">	                  + <span class="string">"&amp;sex="</span> + <span class="built_in">document</span>.getElementById(<span class="string">"staffSex"</span>).value </div><div class="line">	                  + <span class="string">"&amp;job="</span> + <span class="built_in">document</span>.getElementById(<span class="string">"staffJob"</span>).value;</div><div class="line">	request.setRequestHeader(<span class="string">"Content-type"</span>,<span class="string">"application/x-www-form-urlencoded"</span>);</div><div class="line">	request.send(data);</div><div class="line">	request.onreadystatechange = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">		<span class="keyword">if</span> (request.readyState===<span class="number">4</span>) &#123;</div><div class="line">			<span class="keyword">if</span> (request.status===<span class="number">200</span>) &#123; </div><div class="line">				<span class="keyword">var</span> data = <span class="built_in">JSON</span>.parse(request.responseText);</div><div class="line">				<span class="keyword">if</span> (data.success) &#123; </div><div class="line">					<span class="built_in">document</span>.getElementById(<span class="string">"createResult"</span>).innerHTML = data.msg;</div><div class="line">				&#125; <span class="keyword">else</span> &#123;</div><div class="line">					<span class="built_in">document</span>.getElementById(<span class="string">"createResult"</span>).innerHTML = <span class="string">"出现错误："</span> + data.msg;</div><div class="line">				&#125;</div><div class="line">			&#125; <span class="keyword">else</span> &#123;</div><div class="line">				alert(<span class="string">"发生错误："</span> + request.status);</div><div class="line">			&#125;</div><div class="line">		&#125; </div><div class="line">	&#125;</div><div class="line">&#125;</div><div class="line">&lt;<span class="regexp">/script&gt;</span></div></pre></td></tr></table></figure>
<figure class="highlight php"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div></pre></td><td class="code"><pre><div class="line"><span class="meta">&lt;?php</span></div><div class="line"><span class="comment">//设置页面内容是html编码格式是utf-8</span></div><div class="line">header(<span class="string">"Content-Type: text/plain;charset=utf-8"</span>); </div><div class="line"><span class="comment">//header("Content-Type: application/json;charset=utf-8"); </span></div><div class="line"><span class="comment">//header("Content-Type: text/xml;charset=utf-8"); </span></div><div class="line"><span class="comment">//header("Content-Type: text/html;charset=utf-8"); </span></div><div class="line"><span class="comment">//header("Content-Type: application/javascript;charset=utf-8"); </span></div><div class="line"></div><div class="line"><span class="comment">//定义一个多维数组，包含员工的信息，每条员工信息为一个数组</span></div><div class="line">$staff = <span class="keyword">array</span></div><div class="line">	(</div><div class="line">		<span class="keyword">array</span>(<span class="string">"name"</span> =&gt; <span class="string">"洪七"</span>, <span class="string">"number"</span> =&gt; <span class="string">"101"</span>, <span class="string">"sex"</span> =&gt; <span class="string">"男"</span>, <span class="string">"job"</span> =&gt; <span class="string">"总经理"</span>),</div><div class="line">		<span class="keyword">array</span>(<span class="string">"name"</span> =&gt; <span class="string">"郭靖"</span>, <span class="string">"number"</span> =&gt; <span class="string">"102"</span>, <span class="string">"sex"</span> =&gt; <span class="string">"男"</span>, <span class="string">"job"</span> =&gt; <span class="string">"开发工程师"</span>),</div><div class="line">		<span class="keyword">array</span>(<span class="string">"name"</span> =&gt; <span class="string">"黄蓉"</span>, <span class="string">"number"</span> =&gt; <span class="string">"103"</span>, <span class="string">"sex"</span> =&gt; <span class="string">"女"</span>, <span class="string">"job"</span> =&gt; <span class="string">"产品经理"</span>)</div><div class="line">	);</div><div class="line"></div><div class="line"><span class="comment">//判断如果是get请求，则进行搜索；如果是POST请求，则进行新建</span></div><div class="line"><span class="comment">//$_SERVER是一个超全局变量，在一个脚本的全部作用域中都可用，不用使用global关键字</span></div><div class="line"><span class="comment">//$_SERVER["REQUEST_METHOD"]返回访问页面使用的请求方法</span></div><div class="line"><span class="keyword">if</span> ($_SERVER[<span class="string">"REQUEST_METHOD"</span>] == <span class="string">"GET"</span>) &#123;</div><div class="line">	search();</div><div class="line">&#125; <span class="keyword">elseif</span> ($_SERVER[<span class="string">"REQUEST_METHOD"</span>] == <span class="string">"POST"</span>)&#123;</div><div class="line">	create();</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">//通过员工编号搜索员工</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">search</span><span class="params">()</span></span>&#123;</div><div class="line">	<span class="comment">//检查是否有员工编号的参数</span></div><div class="line">	<span class="comment">//isset检测变量是否设置；empty判断值为否为空</span></div><div class="line">	<span class="comment">//超全局变量 $_GET 和 $_POST 用于收集表单数据</span></div><div class="line">	<span class="keyword">if</span> (!<span class="keyword">isset</span>($_GET[<span class="string">"number"</span>]) || <span class="keyword">empty</span>($_GET[<span class="string">"number"</span>])) &#123;</div><div class="line">		<span class="keyword">echo</span> <span class="string">'&#123;"success":false,"msg":"参数错误"&#125;'</span>;</div><div class="line">		<span class="keyword">return</span>;</div><div class="line">	&#125;</div><div class="line">	<span class="comment">//函数之外声明的变量拥有 Global 作用域，只能在函数以外进行访问。</span></div><div class="line">	<span class="comment">//global 关键词用于访问函数内的全局变量</span></div><div class="line">	<span class="keyword">global</span> $staff;</div><div class="line">	<span class="comment">//获取number参数</span></div><div class="line">	$number = $_GET[<span class="string">"number"</span>];</div><div class="line">	$result = <span class="string">'&#123;"success":false,"msg":"没有找到员工。"&#125;'</span>;</div><div class="line">	</div><div class="line">	<span class="comment">//遍历$staff多维数组，查找key值为number的员工是否存在，如果存在，则修改返回结果</span></div><div class="line">	<span class="keyword">foreach</span> ($staff <span class="keyword">as</span> $value) &#123;</div><div class="line">		<span class="keyword">if</span> ($value[<span class="string">"number"</span>] == $number) &#123;</div><div class="line">			$result = <span class="string">'&#123;"success":true,"msg":"找到员工：员工编号：'</span> . $value[<span class="string">"number"</span>] . </div><div class="line">							<span class="string">'，员工姓名：'</span> . $value[<span class="string">"name"</span>] . </div><div class="line">							<span class="string">'，员工性别：'</span> . $value[<span class="string">"sex"</span>] . </div><div class="line">							<span class="string">'，员工职位：'</span> . $value[<span class="string">"job"</span>] . <span class="string">'"&#125;'</span>;</div><div class="line">			<span class="keyword">break</span>;</div><div class="line">		&#125;</div><div class="line">	&#125;</div><div class="line">    <span class="keyword">echo</span> $result;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">//创建员工</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">create</span><span class="params">()</span></span>&#123;</div><div class="line">	<span class="comment">//判断信息是否填写完全</span></div><div class="line">	<span class="keyword">if</span> (!<span class="keyword">isset</span>($_POST[<span class="string">"name"</span>]) || <span class="keyword">empty</span>($_POST[<span class="string">"name"</span>])</div><div class="line">		|| !<span class="keyword">isset</span>($_POST[<span class="string">"number"</span>]) || <span class="keyword">empty</span>($_POST[<span class="string">"number"</span>])</div><div class="line">		|| !<span class="keyword">isset</span>($_POST[<span class="string">"sex"</span>]) || <span class="keyword">empty</span>($_POST[<span class="string">"sex"</span>])</div><div class="line">		|| !<span class="keyword">isset</span>($_POST[<span class="string">"job"</span>]) || <span class="keyword">empty</span>($_POST[<span class="string">"job"</span>])) &#123;</div><div class="line">		<span class="keyword">echo</span> <span class="string">'&#123;"success":false,"msg":"参数错误，员工信息填写不全"&#125;'</span>;</div><div class="line">		<span class="keyword">return</span>;</div><div class="line">	&#125;</div><div class="line">	<span class="comment">//<span class="doctag">TODO:</span> 获取POST表单数据并保存到数据库</span></div><div class="line">	</div><div class="line">	<span class="comment">//提示保存成功</span></div><div class="line">	<span class="keyword">echo</span> <span class="string">'&#123;"success":true,"msg":"员工：'</span> . $_POST[<span class="string">"name"</span>] . <span class="string">' 信息保存成功！"&#125;'</span>;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="meta">?&gt;</span></div></pre></td></tr></table></figure>
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<h2 id="jQuery"><a href="#jQuery" class="headerlink" title="jQuery"></a>jQuery</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div></pre></td><td class="code"><pre><div class="line">&lt;script&gt;</div><div class="line">$(<span class="built_in">document</span>).ready(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; </div><div class="line">	$(<span class="string">"#search"</span>).click(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; </div><div class="line">		$.ajax(&#123; </div><div class="line">		    type: <span class="string">"GET"</span>, 	</div><div class="line">			url: <span class="string">"http://127.0.0.1:8080/ajaxdemo/serverjson2.php?number="</span> + $(<span class="string">"#keyword"</span>).val(),</div><div class="line">			dataType: <span class="string">"json"</span>,</div><div class="line">			success: <span class="function"><span class="keyword">function</span>(<span class="params">data</span>) </span>&#123;</div><div class="line">				<span class="keyword">if</span> (data.success) &#123; </div><div class="line">					$(<span class="string">"#searchResult"</span>).html(data.msg);</div><div class="line">				&#125; <span class="keyword">else</span> &#123;</div><div class="line">					$(<span class="string">"#searchResult"</span>).html(<span class="string">"出现错误："</span> + data.msg);</div><div class="line">				&#125;  </div><div class="line">			&#125;,</div><div class="line">			error: <span class="function"><span class="keyword">function</span>(<span class="params">jqXHR</span>)</span>&#123;     </div><div class="line">			   alert(<span class="string">"发生错误："</span> + jqXHR.status);  </div><div class="line">			&#125;,     </div><div class="line">		&#125;);</div><div class="line">	&#125;);</div><div class="line">	$(<span class="string">"#save"</span>).click(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; </div><div class="line">		$.ajax(&#123; </div><div class="line">		    type: <span class="string">"POST"</span>, 	</div><div class="line">			url: <span class="string">"serverjson.php"</span>,</div><div class="line">			data: &#123;</div><div class="line">				name: $(<span class="string">"#staffName"</span>).val(), </div><div class="line">				number: $(<span class="string">"#staffNumber"</span>).val(), </div><div class="line">				sex: $(<span class="string">"#staffSex"</span>).val(), </div><div class="line">				job: $(<span class="string">"#staffJob"</span>).val()</div><div class="line">			&#125;,</div><div class="line">			dataType: <span class="string">"json"</span>,</div><div class="line">			success: <span class="function"><span class="keyword">function</span>(<span class="params">data</span>)</span>&#123;</div><div class="line">				<span class="keyword">if</span> (data.success) &#123; </div><div class="line">					$(<span class="string">"#createResult"</span>).html(data.msg);</div><div class="line">				&#125; <span class="keyword">else</span> &#123;</div><div class="line">					$(<span class="string">"#createResult"</span>).html(<span class="string">"出现错误："</span> + data.msg);</div><div class="line">				&#125;  </div><div class="line">			&#125;,</div><div class="line">			error: <span class="function"><span class="keyword">function</span>(<span class="params">jqXHR</span>)</span>&#123;     </div><div class="line">			   alert(<span class="string">"发生错误："</span> + jqXHR.status);  </div><div class="line">			&#125;,     </div><div class="line">		&#125;);</div><div class="line">	&#125;);</div><div class="line">&#125;);</div><div class="line"><span class="xml"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></div></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div></pre></td><td class="code"><pre><div class="line">&lt;?php</div><div class="line">//设置页面内容是html编码格式是utf-8</div><div class="line">//header(&quot;Content-Type: text/plain;charset=utf-8&quot;); </div><div class="line">header(&apos;Access-Control-Allow-Origin:*&apos;);</div><div class="line">header(&apos;Access-Control-Allow-Methods:POST,GET&apos;);</div><div class="line">header(&apos;Access-Control-Allow-Credentials:true&apos;); </div><div class="line">header(&quot;Content-Type: application/json;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: text/xml;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: text/html;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: application/javascript;charset=utf-8&quot;); </div><div class="line"></div><div class="line">//定义一个多维数组，包含员工的信息，每条员工信息为一个数组</div><div class="line">$staff = array</div><div class="line">	(</div><div class="line">		array(&quot;name&quot; =&gt; &quot;洪七&quot;, &quot;number&quot; =&gt; &quot;101&quot;, &quot;sex&quot; =&gt; &quot;男&quot;, &quot;job&quot; =&gt; &quot;总经理&quot;),</div><div class="line">		array(&quot;name&quot; =&gt; &quot;郭靖&quot;, &quot;number&quot; =&gt; &quot;102&quot;, &quot;sex&quot; =&gt; &quot;男&quot;, &quot;job&quot; =&gt; &quot;开发工程师&quot;),</div><div class="line">		array(&quot;name&quot; =&gt; &quot;黄蓉&quot;, &quot;number&quot; =&gt; &quot;103&quot;, &quot;sex&quot; =&gt; &quot;女&quot;, &quot;job&quot; =&gt; &quot;产品经理&quot;)</div><div class="line">	);</div><div class="line"></div><div class="line">//判断如果是get请求，则进行搜索；如果是POST请求，则进行新建</div><div class="line">//$_SERVER是一个超全局变量，在一个脚本的全部作用域中都可用，不用使用global关键字</div><div class="line">//$_SERVER[&quot;REQUEST_METHOD&quot;]返回访问页面使用的请求方法</div><div class="line">if ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;GET&quot;) &#123;</div><div class="line">	search();</div><div class="line">&#125; elseif ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;POST&quot;)&#123;</div><div class="line">	create();</div><div class="line">&#125;</div><div class="line"></div><div class="line">//通过员工编号搜索员工</div><div class="line">function search()&#123;</div><div class="line">	//检查是否有员工编号的参数</div><div class="line">	//isset检测变量是否设置；empty判断值为否为空</div><div class="line">	//超全局变量 $_GET 和 $_POST 用于收集表单数据</div><div class="line">	if (!isset($_GET[&quot;number&quot;]) || empty($_GET[&quot;number&quot;])) &#123;</div><div class="line">		echo &apos;&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;参数错误&quot;&#125;&apos;;</div><div class="line">		return;</div><div class="line">	&#125;</div><div class="line">	//函数之外声明的变量拥有 Global 作用域，只能在函数以外进行访问。</div><div class="line">	//global 关键词用于访问函数内的全局变量</div><div class="line">	global $staff;</div><div class="line">	//获取number参数</div><div class="line">	$number = $_GET[&quot;number&quot;];</div><div class="line">	$result = &apos;&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;没有找到员工。&quot;&#125;&apos;;</div><div class="line">	</div><div class="line">	//遍历$staff多维数组，查找key值为number的员工是否存在，如果存在，则修改返回结果</div><div class="line">	foreach ($staff as $value) &#123;</div><div class="line">		if ($value[&quot;number&quot;] == $number) &#123;</div><div class="line">			$result = &apos;&#123;&quot;success&quot;:true,&quot;msg&quot;:&quot;找到员工：员工编号：&apos; . $value[&quot;number&quot;] . </div><div class="line">							&apos;，员工姓名：&apos; . $value[&quot;name&quot;] . </div><div class="line">							&apos;，员工性别：&apos; . $value[&quot;sex&quot;] . </div><div class="line">							&apos;，员工职位：&apos; . $value[&quot;job&quot;] . &apos;&quot;&#125;&apos;;</div><div class="line">			break;</div><div class="line">		&#125;</div><div class="line">	&#125;</div><div class="line">    echo $result;</div><div class="line">&#125;</div><div class="line"></div><div class="line">//创建员工</div><div class="line">function create()&#123;</div><div class="line">	//判断信息是否填写完全</div><div class="line">	if (!isset($_POST[&quot;name&quot;]) || empty($_POST[&quot;name&quot;])</div><div class="line">		|| !isset($_POST[&quot;number&quot;]) || empty($_POST[&quot;number&quot;])</div><div class="line">		|| !isset($_POST[&quot;sex&quot;]) || empty($_POST[&quot;sex&quot;])</div><div class="line">		|| !isset($_POST[&quot;job&quot;]) || empty($_POST[&quot;job&quot;])) &#123;</div><div class="line">		echo &apos;&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;参数错误，员工信息填写不全&quot;&#125;&apos;;</div><div class="line">		return;</div><div class="line">	&#125;</div><div class="line">	//TODO: 获取POST表单数据并保存到数据库</div><div class="line">	</div><div class="line">	//提示保存成功</div><div class="line">	echo &apos;&#123;&quot;success&quot;:true,&quot;msg&quot;:&quot;员工：&apos; . $_POST[&quot;name&quot;] . &apos; 信息保存成功！&quot;&#125;&apos;;</div><div class="line">&#125;</div><div class="line"></div><div class="line">?&gt;</div></pre></td></tr></table></figure>
<hr>
<h2 id="jQuery-json"><a href="#jQuery-json" class="headerlink" title="jQuery-json"></a>jQuery-json</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div></pre></td><td class="code"><pre><div class="line">&lt;script&gt;</div><div class="line">$(document).ready(function()&#123; </div><div class="line">	$(&quot;#search&quot;).click(function()&#123; </div><div class="line">		$.ajax(&#123; </div><div class="line">		    type: &quot;GET&quot;, 	</div><div class="line">			url: &quot;http://127.0.0.1:8000/ajaxdemo/serverjsonp.php?number=&quot; + $(&quot;#keyword&quot;).val(),</div><div class="line">			dataType: &quot;jsonp&quot;,</div><div class="line">			jsonp: &quot;callback&quot;,</div><div class="line">			success: function(data) &#123;</div><div class="line">				if (data.success) &#123;</div><div class="line">					$(&quot;#searchResult&quot;).html(data.msg);</div><div class="line">				&#125; else &#123;</div><div class="line">					$(&quot;#searchResult&quot;).html(&quot;出现错误：&quot; + data.msg);</div><div class="line">				&#125;  </div><div class="line">			&#125;,</div><div class="line">			error: function(jqXHR)&#123;     </div><div class="line">			   alert(&quot;发生错误：&quot; + jqXHR.status);  </div><div class="line">			&#125;,     </div><div class="line">		&#125;);</div><div class="line">	&#125;);</div><div class="line">	</div><div class="line">	$(&quot;#save&quot;).click(function()&#123; </div><div class="line">		$.ajax(&#123; </div><div class="line">		    type: &quot;POST&quot;, 	</div><div class="line">			url: &quot;http://127.0.0.1:8000/ajaxdemo/serverjsonp.php&quot;,</div><div class="line">			data: &#123;</div><div class="line">				name: $(&quot;#staffName&quot;).val(), </div><div class="line">				number: $(&quot;#staffNumber&quot;).val(), </div><div class="line">				sex: $(&quot;#staffSex&quot;).val(), </div><div class="line">				job: $(&quot;#staffJob&quot;).val()</div><div class="line">			&#125;,</div><div class="line">			dataType: &quot;json&quot;,</div><div class="line">			success: function(data)&#123;</div><div class="line">				if (data.success) &#123; </div><div class="line">					$(&quot;#createResult&quot;).html(data.msg);</div><div class="line">				&#125; else &#123;</div><div class="line">					$(&quot;#createResult&quot;).html(&quot;出现错误：&quot; + data.msg);</div><div class="line">				&#125;  </div><div class="line">			&#125;,</div><div class="line">			error: function(jqXHR)&#123;     </div><div class="line">			   alert(&quot;发生错误：&quot; + jqXHR.status);  </div><div class="line">			&#125;,     </div><div class="line">		&#125;);</div><div class="line">	&#125;);</div><div class="line">&#125;);</div><div class="line">&lt;/script&gt;</div></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div></pre></td><td class="code"><pre><div class="line">&lt;?php</div><div class="line">//设置页面内容是html编码格式是utf-8</div><div class="line">//header(&quot;Content-Type: text/plain;charset=utf-8&quot;); </div><div class="line">header(&quot;Content-Type: application/json;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: text/xml;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: text/html;charset=utf-8&quot;); </div><div class="line">//header(&quot;Content-Type: application/javascript;charset=utf-8&quot;); </div><div class="line"></div><div class="line">//定义一个多维数组，包含员工的信息，每条员工信息为一个数组</div><div class="line">$staff = array</div><div class="line">	(</div><div class="line">		array(&quot;name&quot; =&gt; &quot;洪七&quot;, &quot;number&quot; =&gt; &quot;101&quot;, &quot;sex&quot; =&gt; &quot;男&quot;, &quot;job&quot; =&gt; &quot;总经理&quot;),</div><div class="line">		array(&quot;name&quot; =&gt; &quot;郭靖&quot;, &quot;number&quot; =&gt; &quot;102&quot;, &quot;sex&quot; =&gt; &quot;男&quot;, &quot;job&quot; =&gt; &quot;开发工程师&quot;),</div><div class="line">		array(&quot;name&quot; =&gt; &quot;黄蓉&quot;, &quot;number&quot; =&gt; &quot;103&quot;, &quot;sex&quot; =&gt; &quot;女&quot;, &quot;job&quot; =&gt; &quot;产品经理&quot;)</div><div class="line">	);</div><div class="line"></div><div class="line">//判断如果是get请求，则进行搜索；如果是POST请求，则进行新建</div><div class="line">//$_SERVER是一个超全局变量，在一个脚本的全部作用域中都可用，不用使用global关键字</div><div class="line">//$_SERVER[&quot;REQUEST_METHOD&quot;]返回访问页面使用的请求方法</div><div class="line">if ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;GET&quot;) &#123;</div><div class="line">	search();</div><div class="line">&#125; elseif ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;POST&quot;)&#123;</div><div class="line">	create();</div><div class="line">&#125;</div><div class="line"></div><div class="line">//通过员工编号搜索员工</div><div class="line">function search()&#123;</div><div class="line">	$jsonp = $_GET[&quot;callback&quot;];</div><div class="line">	//检查是否有员工编号的参数</div><div class="line">	//isset检测变量是否设置；empty判断值为否为空</div><div class="line">	//超全局变量 $_GET 和 $_POST 用于收集表单数据</div><div class="line">	if (!isset($_GET[&quot;number&quot;]) || empty($_GET[&quot;number&quot;])) &#123;</div><div class="line">		echo $jsonp . &apos;(&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;参数错误&quot;&#125;)&apos;;</div><div class="line">		return;</div><div class="line">	&#125;</div><div class="line">	//函数之外声明的变量拥有 Global 作用域，只能在函数以外进行访问。</div><div class="line">	//global 关键词用于访问函数内的全局变量</div><div class="line">	global $staff;</div><div class="line">	//获取number参数</div><div class="line">	$number = $_GET[&quot;number&quot;];</div><div class="line">	$result = $jsonp . &apos;(&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;没有找到员工。&quot;&#125;)&apos;;</div><div class="line">	</div><div class="line">	//遍历$staff多维数组，查找key值为number的员工是否存在，如果存在，则修改返回结果</div><div class="line">	foreach ($staff as $value) &#123;</div><div class="line">		if ($value[&quot;number&quot;] == $number) &#123;</div><div class="line">			$result = $jsonp . &apos;(&#123;&quot;success&quot;:true,&quot;msg&quot;:&quot;找到员工：员工编号：&apos; . $value[&quot;number&quot;] .</div><div class="line">							&apos;，员工姓名：&apos; . $value[&quot;name&quot;] . </div><div class="line">							&apos;，员工性别：&apos; . $value[&quot;sex&quot;] . </div><div class="line">							&apos;，员工职位：&apos; . $value[&quot;job&quot;] . &apos;&quot;&#125;)&apos;;</div><div class="line">			break;</div><div class="line">		&#125;</div><div class="line">	&#125;</div><div class="line">    echo $result;</div><div class="line">&#125;</div><div class="line"></div><div class="line">//创建员工</div><div class="line">function create()&#123;</div><div class="line">	//判断信息是否填写完全</div><div class="line">	if (!isset($_POST[&quot;name&quot;]) || empty($_POST[&quot;name&quot;])</div><div class="line">		|| !isset($_POST[&quot;number&quot;]) || empty($_POST[&quot;number&quot;])</div><div class="line">		|| !isset($_POST[&quot;sex&quot;]) || empty($_POST[&quot;sex&quot;])</div><div class="line">		|| !isset($_POST[&quot;job&quot;]) || empty($_POST[&quot;job&quot;])) &#123;</div><div class="line">		echo &apos;&#123;&quot;success&quot;:false,&quot;msg&quot;:&quot;参数错误，员工信息填写不全&quot;&#125;&apos;;</div><div class="line">		return;</div><div class="line">	&#125;</div><div class="line">	//TODO: 获取POST表单数据并保存到数据库</div><div class="line">	</div><div class="line">	//提示保存成功</div><div class="line">	echo &apos;&#123;&quot;success&quot;:true,&quot;msg&quot;:&quot;员工：&apos; . $_POST[&quot;name&quot;] . &apos; 信息保存成功！&quot;&#125;&apos;;</div><div class="line">&#125;</div><div class="line"></div><div class="line">?&gt;</div></pre></td></tr></table></figure>

      
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